EP1958228B1 - Method of making a glass envelope - Google Patents

Method of making a glass envelope Download PDF

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Publication number
EP1958228B1
EP1958228B1 EP06838743A EP06838743A EP1958228B1 EP 1958228 B1 EP1958228 B1 EP 1958228B1 EP 06838743 A EP06838743 A EP 06838743A EP 06838743 A EP06838743 A EP 06838743A EP 1958228 B1 EP1958228 B1 EP 1958228B1
Authority
EP
European Patent Office
Prior art keywords
frit
substrate
laser beam
mask
frit wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP06838743A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1958228A4 (en
EP1958228A2 (en
Inventor
Keith J Becken
Stephan L Logunov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Corning Inc
Original Assignee
Corning Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Corning Inc filed Critical Corning Inc
Publication of EP1958228A2 publication Critical patent/EP1958228A2/en
Publication of EP1958228A4 publication Critical patent/EP1958228A4/en
Application granted granted Critical
Publication of EP1958228B1 publication Critical patent/EP1958228B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/842—Containers
    • H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H05B33/04—Sealing arrangements, e.g. against humidity
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/871—Self-supporting sealing arrangements
    • H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass

Definitions

  • This invention is directed to a method for encapsulating a display element such as is used for glass substrates for flat panel display devices.
  • OLEDs Organic light emitting diodes
  • OLED flat panel displays in particular are known to be very bright and to have good color contrast and wide viewing angle. It is well known that the life of the OLED display can be significantly increased if the electrodes and organic layers located therein are hermetically sealed from the ambient environment.
  • OLED displays and in particular the electrodes and organic layers located therein, are susceptible to degradation resulting from interaction with oxygen and moisture leaking into the OLED display from the ambient environment.
  • OLED display Unfortunately, in the past it has been very difficult to develop a sealing process to hermetically seal the OLED display.
  • One way to seal the OLED display is to form a hermetic seal by melting a low temperature frit doped with a material that is highly absorbent at a specific wavelength of light.
  • a high power laser may be used to heat and soften the frit which forms a hermetic seal between a cover glass with the frit located thereon and a substrate glass with OLEDs located thereon.
  • the frit is typically about 0.5 mm to 1mm wide and approximately 6-100 ⁇ m thick. If the absorption and thickness of the frit is uniform then sealing can be done at a constant laser energy and translation speed so as to provide a uniform temperature rise at the frit location.
  • U.S. Patent Publication No. 2004/0207314 describes the use of an infrared lamp used in conjunction with an opaque block that shields the region inside a frit line. What is needed is a method of heating the frit which provides sufficient heating of the frit to melt the frit and seal the substrates, while also providing appropriate cooling of the frit, without undue heating and damage to the display element.
  • the invention provides a method of encapsulating a display element according to claim 1.
  • the frit wall preferably comprises a frame shape. Moreover, a plurality of display elements may be disposed between the first and second substrates.
  • the beam preferably passes through a mask comprising a transparent region shaped as a slit.
  • the mask may include an absorbing surface or a reflective surface.
  • the beam is preferably traversed over the frit at a speed greater than about 10 mm/s. The traversing may be accomplished by reflecting the beam from at least one galvanic mirror.
  • FIG. 1 is a cross sectional side view of a display device according to an embodiment of the present invention.
  • FIG. 2 is a cross sectional side view of the first substrate and the frit deposited thereon in accordance with an embodiment of the present invention
  • FIG. 3 is a top view of the first substrate of FIG. 2 showing the frit deposited in the shape of a frame.
  • FIG. 4 is a partial side cross sectional view of a display device in accordance with an embodiment of the present invention including a display element and electrodes deposited thereon, and showing the position of the laser and laser beam during the sealing operation..
  • FIG. 5 is a partial top view of the mask of FIG. 4 and a portion of the frit
  • FIG. 6 is a top view of a mask having a plurality of transparent regions for sealing a plurality of OLED display devices.
  • FIG. 7 is a plot of cooling curves (rates) for an OLED display device sealed with a focused laser beam at various traverse speeds of the laser spot over the frit compared with the intrinsic cooling curve.
  • FIG. 8 is a plot of cooling curves (rates) for an OLED display device sealed with a defocused laser beam at various traverse speeds of the laser spot over the frit, compared with the intrinsic cooling curve.
  • FIG. 9 is a side cross sectional view of a display device having a display element and electrodes deposited thereon, and showing the position of a laser and galvanometer controlled laser beam during the sealing operation.
  • sealing techniques of the present invention are described below with respect to manufacturing a hermetically sealed OLED display, it should be understood that the same or similar sealing techniques can be used to seal two glass plates to one another that can be used in a wide variety of applications and device. Accordingly, the sealing techniques of the present invention should not be construed in a limited manner.
  • FIG. 1 a cross-sectional side view of a hermetically sealed organic light emitting diode (OLED) display device in accordance with an embodiment of the present invention is shown, generally designated by reference numeral 10 comprising first substrate 12, frit 14, second substrate 16, at least one OLED element 18 and at least one electrode 20 in electrical contact with the OLED element.
  • OLED element 18 is in electrical contact with an anode electrode and a cathode electrode.
  • electrode 20 in FIG. 1 represents either electrode.
  • display device 10 may have many OLED elements disposed therein.
  • the typical OLED element 18 includes one or more organic layers (not shown) and anode/cathode electrodes.
  • any known OLED element 18 or future OLED element 18 can be used in display device 10.
  • another type of thin film device can be deposited besides OLED element 18.
  • thin film sensors may be fabricated using the present invention.
  • first substrate 12 is a transparent glass plate like the ones manufactured and sold by Coming Incorporated under the brand names of Code 1737 glass or Eagle 2000 TM glass.
  • first substrate 12 can be any transparent glass plate such as, for example, the ones manufactured and sold by Asahi Glass Co. (e.g., OA10 glass and OA21 glass), Nippon Electric Glass Co., NHTechno and Samsung Corning Precision Glass Co.
  • Second substrate 16 may be the same glass substrate as first substrate 12, or second substrate 16 may be a non-transparent substrate.
  • frit 14 is deposited on first substrate 12, typically as a line of a frit paste comprising a glass powder, a binder (usually organic) and/or a liquid vehicle.
  • Frit 14 can be applied to first substrate 12 by screen-printing or by a programmable auger robot which provides a well-shaped pattern on first substrate 12.
  • frit 14 can be placed approximately 1 mm away from the free edges 13 of first substrate 12, and is typically deposited in the shape of a closed frame or wall.
  • frit 14 is a low temperature glass frit that has a substantial optical absorption cross-section at a predetermined wavelength which matches or substantially matches the operating wavelength of a laser used in the sealing process.
  • Frit 14 may, for example, contain one or more light absorbing ions chosen from the group including iron, copper, vanadium, neodymium and combinations thereof (for example). Frit 14 may also include a filler (e.g., an inversion filler or an additive filler) which changes the coefficient of thermal expansion of frit 14 so that it matches or substantially matches the coefficient of thermal expansions of substrates 12 and 16.
  • a filler e.g., an inversion filler or an additive filler
  • Frit 14 may also be pre-sintered prior to sealing first substrate 12 to second substrate 16.
  • frit 14 which was deposited onto first substrate 12, is heated so that it becomes attached to first substrate 12.
  • first substrate 12 with the frit pattern located thereon can then be placed in a furnace which "fires" or consolidates frit 14 at a temperature that depends on the composition of the frit.
  • frit 14 is heated and organic binder materials contained within the frit are burned out.
  • frit 14 After frit 14 is pre-sintered, it can be ground, if necessary, so that the height variation along the frit line does not exceed about 2-4 ⁇ m, with a typical target height h which can be 10 ⁇ m to greater than 30 ⁇ m, depending on the application for device 10; however, more typically height h is about 12-15 ⁇ m. If the height variation is larger, a gap which may be formed between the frit and substrate 16 when substrates 12 and 16 are joined may not close when frit 14 melts during laser sealing to a second substrate, or the gap may introduce stresses which can crack the substrates, particularly during cooling of the frit and/or substrates. An adequate but not overly thick frit height h allows the substrates to be sealed from the backside of first substrate 12.
  • frit 14 If frit 14 is too thin it does not leave enough material to absorb the laser radiation, resulting in failure. If frit 14 is too thick it will be able to absorb enough energy at the first surface to melt, but will prevent the necessary energy needed to melt the frit from reaching the region of the frit proximate secondary substrate 16. This usually results in poor or spotty bonding of the two glass substrates.
  • first substrate 12 may go through a mild ultrasonic cleaning environment to remove any debris that has accumulated to this point.
  • the typical solutions used here can be considerably milder than the ones used for cleaning display glass which has no additional deposition. During cleaning, the temperature can be kept low to avoid degradation of deposited frit 14.
  • the pre-sintered first substrate 12 can be placed in a vacuum oven at a temperature of 100°C for 6 or more hours. After removal from the oven, the pre-sintered first substrate 12 can be placed in a clean room box to deter dust and debris from accumulating on it before performing the sealing process.
  • the sealing process includes placing first substrate 12, with frit 14, on top of second substrate 16, with one or more OLEDs 18 and one or more electrodes 20 deposited on the second substrate 16, in such a manner that frit 14, the one or more OLEDs 18, and electrodes 20 are sandwiched between the two substrates 12 and 16 separated by frit 14. Mild pressure can be applied to substrates 12 and 16 to keep them in contact during the sealing process.
  • laser 22 directs laser beam 24 onto frit 14 through first substrate 12 and heats frit 14 such that frit 14 melts and forms a hermetic seal which connects and bonds substrate 12 to substrate 16.
  • the hermetic seal also protects OLEDs 18 by preventing oxygen and moisture in the ambient environment from entering into OLED display 10.
  • Laser beam 24 can be defocused, for example, to make the temperature gradient within frit 14 more gradual. It should be noted that if the gradient is too steep (focus is too tight), OLED display 10 may exhibit cracking and subsequent failure. Frit 14 generally needs a warm up and cool down phase before melting. In addition, the pre-sintered first substrate should be stored in an inert atmosphere to prevent re-adsorption of O 2 and H 2 O before melting.
  • the speed of travel of the laser 22 (or beam 24 ) to the frit pattern can range from between about 0.5 mm/s to as much as 300 mm/s, although a speed of between 30 mm/s and 40 mm/s is more typical.
  • the power necessary from the laser beam may vary depending on the optical absorption coefficient ⁇ and thickness h of frit 14. The necessary power is also affected if a reflective or absorbent layer is placed beneath frit 14 (between frit 14 and substrate 16 ) such as materials used to fabricate electrode(s) 20, and by the speed of traverse of laser beam 24 over the frit. Additionally, the composition, homogeneity and filler particle size of the frit 14 can vary. This, too, can adversely affect the way the frit absorbs the optical energy of impinging laser beam 24. As laser beam 24 is traversed over frit 14, frit 14 melts to seal substrates 12 and 16 one to the other.
  • the gap between substrate 12 and 16 caused by the frit seal forms a hermetic pocket or envelope for OLED element 18 between the substrates. It should be noted that if second substrate 16 is transparent at the sealing wavelength, sealing may be performed through second substrate 16, or both substrates 12 and 16.
  • Cooling of display device 10 should be undertaken such that excess stress is not experienced by device 10 (e.g. substrates 12 and 16 ) during the cooling down of the just-sealed substrates and frit. Unless properly cooled, these stresses may result in a weak bond between the substrates, and impact the hermeticity of the bond.
  • the laser beam which impinges on the frit through one of the substrates preferably has a substantially circular beam shape in a radial cross section. The beam therefore impinges on the frit as a generally circular spot, and the intensity distribution across a diameter of the beam is preferably decreasing as a function of distance from the axis of the beam, having a peak intensity at or near the center axis of the beam.
  • the beam may be substantially Gaussian.
  • the diameter 2 ⁇ of the spot in a conventional sealing method (where ⁇ is that distance from the beam axis for which the intensity of the beam is 1/e 2 the maximum beam intensity) is chosen to be generally about equal to or less than the width of the frit - on the order of between about 0.5 and 1 mm.
  • a laser spot diameter of less than about 1 mm may result in rapid cooling of the frit/substrate as the spot leaves a particular point on the frit, when what is desired is a relatively slow cool down which can result in an anneal of the frit/substrate.
  • a faster sealing speed is desirable.
  • a spot diameter greater than about 2 times the width of the frit line between first and second substrates 12, 16 is proposed.
  • the intensity distribution across a diameter of the spot is decreasing as a function of distance from a center axis of the beam.
  • the beam may have a substantially Gaussian intensity profile, but may have other shapes, such as triangular.
  • a mask 32 shown in FIG. 4 is positioned over the first substrate; more particularly, mask 32 is positioned such that a transparent or open portion of the mask is positioned above the line of frit disposed between the substrates.
  • FIG. 5 shows a close-up view of a portion of mask 32 comprising a transmission region 34 having a width w t approximately equal to or, depending on the distance between the mask and first substrate 12, wider than the width of the frit line, w f , and an opaque region 36.
  • Laser beam 24 is then traced along the transmission region in a longitudinal direction indicated by arrow 37 and hence over the frit line, heating the frit and sealing the substrates with a hermetic seal.
  • Beam spot 38 is blocked in a width-wise direction (indicated by the dashed-line portion of spot 38, and arrow 39 ) on either side of frit 14 by opaque region 36, while simultaneously being unobstructed in the longitudinal direction (i.e. along a length of the frit) through transmission region 34.
  • the beam (and the spot) preferably has a circularly symmetric intensity distribution, and the intensity distribution in the longitudinal direction is unobstructed, the-tail-off of the intensity along a length of the frit (due to the decreasing intensity distribution) provides for a relatively slow cool down of the frit.
  • the portion of the beam which passes through transparent region 34 and impinges on the frit preferably has a substantially constant (flat) intensity, varying across the width of the frit (i.e. orthogonal to the direction of travel of the beam as it traverses the frit) no more than about 10% from a peak value at the center axis of the beam, thus providing for relatively even heating of frit 14.
  • Mask 32 may be absorbing or reflecting. However, a reflecting mask is preferred, since an absorbing mask may be heated sufficiently by the beam to damage the sensitive OLED element adjacent to the frit. Preferably the diameter of the laser spot impinging on the frit is greater than about 1.8 mm.
  • Mask 32 may be formed, for example, by sputtering a coating overtop a clear glass substrate such that the coated portions of the mask reflect or absorb the light from the laser, and a portion of the impinging beam is transmitted through the uncoated clear glass portion or portions 34 of the mask.
  • the transparent portions of the mask coincide with frit 14. For example, if frit 14 is in the shape of a frame, it is desirable that the transparent portion of the mask have a similar shape and dimensions. If a plurality of individual, frame-like frit walls are disposed on a substrate, it is preferred that the mask have a corresponding array of transparent regions 34. Such a mask is depicted in FIG. 6 .
  • laser beam 24 employed as a sealing beam in accordance with embodiments of the invention may be unfocused, or intentionally defocused. Defocusing the beam such that a beam focus point does not fall on the frit can be used in conjunction with the decreasing intensity distribution in a longitudinal direction (relative to the line of frit) to augment the cooling of the frit and/or substrate.
  • FIG. 7 illustrates the cooling curves for a beam spot having a 1/e 2 diameter (i.e. 2 ⁇ ) of about 1.8 mm used to seal a frit line having a width of about 1 mm.
  • Curves 40, 42 and 44 show respectively frit temperature as a function of time for 5 mm/s, 10 mm/s and 20 mm/s laser beam traverse speeds, respectively.
  • the intrinsic cooling curve 46 depicts the cooling behavior of the frit/substrate when the frit has been heated and the laser beam quickly extinguished.
  • the laser beam in FIG: 7 is focused on the frit.
  • FIG. 7 may be compared with FIG. 8 which depicts heating of the frit using the same conditions as FIG. 7 , but-with the laser defocused on the frit.
  • the slower cooling rate is readily observed by comparing a given traverse speed of the laser (e.g. 10 mm/s between the two figures).
  • a mask may be attached to or proximate to the laser itself, the beam from the laser passing through the mask.
  • the mask would comprise a slit-like transparent region, this will require a rotation of the mask as the laser traverses a corner of a frame-shaped frit deposited on substrate 12.
  • relative motion between device 10 and laser beam 24 may be accomplished by moving device 10 relative to the laser beam, or moving the laser (and therefore the beam), relative to the device.
  • the laser, or the device may be mounted to a stage movable in an x-y plane.
  • the stage can be, for example, a linear motor stage whose movement may be computer controlled.
  • both the device and the laser may be stationery, and the beam moved relative to the device by directing beam 24 from the laser to one or more movable reflectors (mirrors) 48, controlled (moved) by galvometers (not shown).
  • the low inertia of galvometer-positioned mirrors compared to the inertia of the device or laser, provides for rapid traverse speeds for the laser beam over frit 14.
  • a constant spot diameter on the frit as the distance between the frit and the laser varies can be attained by using appropriate lensing techniques (e.g. telecentric lenses), as are known in the art.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Glass Compositions (AREA)
EP06838743A 2005-12-06 2006-12-01 Method of making a glass envelope Not-in-force EP1958228B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US74829705P 2005-12-06 2005-12-06
US11/599,738 US7537504B2 (en) 2005-12-06 2006-11-15 Method of encapsulating a display element with frit wall and laser beam
PCT/US2006/045936 WO2007067420A2 (en) 2005-12-06 2006-12-01 Method of making a glass envelope

Publications (3)

Publication Number Publication Date
EP1958228A2 EP1958228A2 (en) 2008-08-20
EP1958228A4 EP1958228A4 (en) 2010-07-07
EP1958228B1 true EP1958228B1 (en) 2012-05-02

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ID=38119403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06838743A Not-in-force EP1958228B1 (en) 2005-12-06 2006-12-01 Method of making a glass envelope

Country Status (8)

Country Link
US (1) US7537504B2 (ko)
EP (1) EP1958228B1 (ko)
JP (1) JP4601673B2 (ko)
KR (1) KR100881795B1 (ko)
CN (1) CN101536133B (ko)
AT (1) ATE556441T1 (ko)
TW (1) TWI344315B (ko)
WO (1) WO2007067420A2 (ko)

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KR100635514B1 (ko) * 2006-01-23 2006-10-18 삼성에스디아이 주식회사 유기전계발광표시장치 및 그 제조방법
JP4624309B2 (ja) * 2006-01-24 2011-02-02 三星モバイルディスプレイ株式會社 有機電界発光表示装置及びその製造方法
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KR100671641B1 (ko) * 2006-01-25 2007-01-19 삼성에스디아이 주식회사 유기 전계 발광 표시장치 및 그 제조 방법
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KR100685853B1 (ko) * 2006-01-25 2007-02-22 삼성에스디아이 주식회사 유기전계발광표시장치 및 그 제조방법
KR100703472B1 (ko) * 2006-01-26 2007-04-03 삼성에스디아이 주식회사 프릿 경화 장치 및 이를 이용한 경화 방법
JP4633674B2 (ja) 2006-01-26 2011-02-16 三星モバイルディスプレイ株式會社 有機電界発光表示装置及びその製造方法
KR100732808B1 (ko) * 2006-01-26 2007-06-27 삼성에스디아이 주식회사 유기전계발광 표시장치의 제조방법
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KR100883072B1 (ko) * 2007-07-12 2009-02-10 엘지전자 주식회사 표시장치
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US8247730B2 (en) * 2007-09-28 2012-08-21 Corning Incorporated Method and apparatus for frit sealing with a variable laser beam
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US8025975B2 (en) * 2007-11-20 2011-09-27 Corning Incorporated Frit-containing pastes for producing sintered frit patterns on glass sheets
US7815480B2 (en) * 2007-11-30 2010-10-19 Corning Incorporated Methods and apparatus for packaging electronic components
US8198807B2 (en) * 2008-02-28 2012-06-12 Corning Incorporated Hermetically-sealed packages for electronic components having reduced unused areas
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JP5224102B2 (ja) * 2008-03-26 2013-07-03 日本電気硝子株式会社 有機ｅｌディスプレイ用封着材料
JP5308717B2 (ja) * 2008-05-26 2013-10-09 浜松ホトニクス株式会社 ガラス溶着方法
JP5308718B2 (ja) * 2008-05-26 2013-10-09 浜松ホトニクス株式会社 ガラス溶着方法
US20090295277A1 (en) * 2008-05-28 2009-12-03 Stephan Lvovich Logunov Glass packages and methods of controlling laser beam characteristics for sealing them
WO2009150976A1 (ja) * 2008-06-11 2009-12-17 浜松ホトニクス株式会社 ガラス溶着方法
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ATE556441T1 (de) 2012-05-15
JP4601673B2 (ja) 2010-12-22
US20070128967A1 (en) 2007-06-07
US7537504B2 (en) 2009-05-26
EP1958228A2 (en) 2008-08-20
CN101536133A (zh) 2009-09-16
WO2007067420A2 (en) 2007-06-14
TW200733785A (en) 2007-09-01
TWI344315B (en) 2011-06-21
JP2008532207A (ja) 2008-08-14
WO2007067420A3 (en) 2009-04-23
KR20070088671A (ko) 2007-08-29

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